diff mbox series

[v4,03/18] drm/i915: Store framestart_delay in dev_priv

Message ID 20210113220935.4151-4-manasi.d.navare@intel.com (mailing list archive)
State New, archived
Headers show
Series VRR/Adaptive Sync Enabling on DP/eDP for TGL+ | expand

Commit Message

Navare, Manasi Jan. 13, 2021, 10:09 p.m. UTC 
From: Ville Syrjälä <ville.syrjala@linux.intel.com>

The vrr calculations will need to know the framestart delay value
we use. Currently we program it always to zero, but should that change
we probably want to stash it somewhere.

Could stick it into the crtc_state I suppose, but since we never
change it let's just stuff it into dev_priv for now.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 22 +++++++++++---------
 drivers/gpu/drm/i915/i915_drv.h              |  2 ++
 2 files changed, 14 insertions(+), 10 deletions(-)

Comments

Navare, Manasi Jan. 21, 2021, 10:32 p.m. UTC | #1 
On Wed, Jan 13, 2021 at 02:09:20PM -0800, Manasi Navare wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> The vrr calculations will need to know the framestart delay value
> we use. Currently we program it always to zero, but should that change
> we probably want to stash it somewhere.
> 
> Could stick it into the crtc_state I suppose, but since we never
> change it let's just stuff it into dev_priv for now.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_display.c | 22 +++++++++++---------
>  drivers/gpu/drm/i915/i915_drv.h              |  2 ++
>  2 files changed, 14 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 0189d379a55e..67a55cfa5354 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -1610,7 +1610,7 @@ static void ilk_enable_pch_transcoder(const struct intel_crtc_state *crtc_state)
>  		val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
>  		/* Configure frame start delay to match the CPU */
>  		val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;
> -		val |= TRANS_CHICKEN2_FRAME_START_DELAY(0);
> +		val |= TRANS_CHICKEN2_FRAME_START_DELAY(dev_priv->framestart_delay);
>  		intel_de_write(dev_priv, reg, val);
>  	}
>  
> @@ -1621,7 +1621,7 @@ static void ilk_enable_pch_transcoder(const struct intel_crtc_state *crtc_state)
>  	if (HAS_PCH_IBX(dev_priv)) {
>  		/* Configure frame start delay to match the CPU */
>  		val &= ~TRANS_FRAME_START_DELAY_MASK;
> -		val |= TRANS_FRAME_START_DELAY(0);
> +		val |= TRANS_FRAME_START_DELAY(dev_priv->framestart_delay);
>  
>  		/*
>  		 * Make the BPC in transcoder be consistent with
> @@ -1666,7 +1666,7 @@ static void lpt_enable_pch_transcoder(struct drm_i915_private *dev_priv,
>  	val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
>  	/* Configure frame start delay to match the CPU */
>  	val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;
> -	val |= TRANS_CHICKEN2_FRAME_START_DELAY(0);
> +	val |= TRANS_CHICKEN2_FRAME_START_DELAY(dev_priv->framestart_delay);
>  	intel_de_write(dev_priv, TRANS_CHICKEN2(PIPE_A), val);
>  
>  	val = TRANS_ENABLE;
> @@ -6679,7 +6679,7 @@ static void hsw_set_frame_start_delay(const struct intel_crtc_state *crtc_state)
>  
>  	val = intel_de_read(dev_priv, reg);
>  	val &= ~HSW_FRAME_START_DELAY_MASK;
> -	val |= HSW_FRAME_START_DELAY(0);
> +	val |= HSW_FRAME_START_DELAY(dev_priv->framestart_delay);
>  	intel_de_write(dev_priv, reg, val);
>  }
>  
> @@ -8741,7 +8741,7 @@ static void i9xx_set_pipeconf(const struct intel_crtc_state *crtc_state)
>  
>  	pipeconf |= PIPECONF_GAMMA_MODE(crtc_state->gamma_mode);
>  
> -	pipeconf |= PIPECONF_FRAME_START_DELAY(0);
> +	pipeconf |= PIPECONF_FRAME_START_DELAY(dev_priv->framestart_delay);
>  
>  	intel_de_write(dev_priv, PIPECONF(crtc->pipe), pipeconf);
>  	intel_de_posting_read(dev_priv, PIPECONF(crtc->pipe));
> @@ -9850,7 +9850,7 @@ static void ilk_set_pipeconf(const struct intel_crtc_state *crtc_state)
>  
>  	val |= PIPECONF_GAMMA_MODE(crtc_state->gamma_mode);
>  
> -	val |= PIPECONF_FRAME_START_DELAY(0);
> +	val |= PIPECONF_FRAME_START_DELAY(dev_priv->framestart_delay);
>  
>  	intel_de_write(dev_priv, PIPECONF(pipe), val);
>  	intel_de_posting_read(dev_priv, PIPECONF(pipe));
> @@ -17153,6 +17153,8 @@ int intel_modeset_init_noirq(struct drm_i915_private *i915)
>  	i915->flip_wq = alloc_workqueue("i915_flip", WQ_HIGHPRI |
>  					WQ_UNBOUND, WQ_UNBOUND_MAX_ACTIVE);
>  
> +	i915->framestart_delay = 0; /* 0-3 */

Should we change this to default to 1 and then since its 0 based use framestart_delay - 1 everywhere?

Manasi

> +
>  	intel_mode_config_init(i915);
>  
>  	ret = intel_cdclk_init(i915);
> @@ -17487,7 +17489,7 @@ static void intel_sanitize_frame_start_delay(const struct intel_crtc_state *crtc
>  
>  		val = intel_de_read(dev_priv, reg);
>  		val &= ~HSW_FRAME_START_DELAY_MASK;
> -		val |= HSW_FRAME_START_DELAY(0);
> +		val |= HSW_FRAME_START_DELAY(dev_priv->framestart_delay);
>  		intel_de_write(dev_priv, reg, val);
>  	} else {
>  		i915_reg_t reg = PIPECONF(cpu_transcoder);
> @@ -17495,7 +17497,7 @@ static void intel_sanitize_frame_start_delay(const struct intel_crtc_state *crtc
>  
>  		val = intel_de_read(dev_priv, reg);
>  		val &= ~PIPECONF_FRAME_START_DELAY_MASK;
> -		val |= PIPECONF_FRAME_START_DELAY(0);
> +		val |= PIPECONF_FRAME_START_DELAY(dev_priv->framestart_delay);
>  		intel_de_write(dev_priv, reg, val);
>  	}
>  
> @@ -17508,7 +17510,7 @@ static void intel_sanitize_frame_start_delay(const struct intel_crtc_state *crtc
>  
>  		val = intel_de_read(dev_priv, reg);
>  		val &= ~TRANS_FRAME_START_DELAY_MASK;
> -		val |= TRANS_FRAME_START_DELAY(0);
> +		val |= TRANS_FRAME_START_DELAY(dev_priv->framestart_delay);
>  		intel_de_write(dev_priv, reg, val);
>  	} else {
>  		enum pipe pch_transcoder = intel_crtc_pch_transcoder(crtc);
> @@ -17517,7 +17519,7 @@ static void intel_sanitize_frame_start_delay(const struct intel_crtc_state *crtc
>  
>  		val = intel_de_read(dev_priv, reg);
>  		val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;
> -		val |= TRANS_CHICKEN2_FRAME_START_DELAY(0);
> +		val |= TRANS_CHICKEN2_FRAME_START_DELAY(dev_priv->framestart_delay);
>  		intel_de_write(dev_priv, reg, val);
>  	}
>  }
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 15e016194685..94a27e72b0a8 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1182,6 +1182,8 @@ struct drm_i915_private {
>  		struct file *mmap_singleton;
>  	} gem;
>  
> +	u8 framestart_delay;
> +
>  	u8 pch_ssc_use;
>  
>  	/* For i915gm/i945gm vblank irq workaround */
> -- 
> 2.19.1
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
Ville Syrjälä Jan. 22, 2021, 12:20 p.m. UTC | #2 
On Thu, Jan 21, 2021 at 02:32:48PM -0800, Navare, Manasi wrote:
> 
> 
> On Wed, Jan 13, 2021 at 02:09:20PM -0800, Manasi Navare wrote:
> > From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > 
> > The vrr calculations will need to know the framestart delay value
> > we use. Currently we program it always to zero, but should that change
> > we probably want to stash it somewhere.
> > 
> > Could stick it into the crtc_state I suppose, but since we never
> > change it let's just stuff it into dev_priv for now.
> > 
> > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_display.c | 22 +++++++++++---------
> >  drivers/gpu/drm/i915/i915_drv.h              |  2 ++
> >  2 files changed, 14 insertions(+), 10 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> > index 0189d379a55e..67a55cfa5354 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display.c
> > @@ -1610,7 +1610,7 @@ static void ilk_enable_pch_transcoder(const struct intel_crtc_state *crtc_state)
> >  		val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
> >  		/* Configure frame start delay to match the CPU */
> >  		val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;
> > -		val |= TRANS_CHICKEN2_FRAME_START_DELAY(0);
> > +		val |= TRANS_CHICKEN2_FRAME_START_DELAY(dev_priv->framestart_delay);
> >  		intel_de_write(dev_priv, reg, val);
> >  	}
> >  
> > @@ -1621,7 +1621,7 @@ static void ilk_enable_pch_transcoder(const struct intel_crtc_state *crtc_state)
> >  	if (HAS_PCH_IBX(dev_priv)) {
> >  		/* Configure frame start delay to match the CPU */
> >  		val &= ~TRANS_FRAME_START_DELAY_MASK;
> > -		val |= TRANS_FRAME_START_DELAY(0);
> > +		val |= TRANS_FRAME_START_DELAY(dev_priv->framestart_delay);
> >  
> >  		/*
> >  		 * Make the BPC in transcoder be consistent with
> > @@ -1666,7 +1666,7 @@ static void lpt_enable_pch_transcoder(struct drm_i915_private *dev_priv,
> >  	val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
> >  	/* Configure frame start delay to match the CPU */
> >  	val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;
> > -	val |= TRANS_CHICKEN2_FRAME_START_DELAY(0);
> > +	val |= TRANS_CHICKEN2_FRAME_START_DELAY(dev_priv->framestart_delay);
> >  	intel_de_write(dev_priv, TRANS_CHICKEN2(PIPE_A), val);
> >  
> >  	val = TRANS_ENABLE;
> > @@ -6679,7 +6679,7 @@ static void hsw_set_frame_start_delay(const struct intel_crtc_state *crtc_state)
> >  
> >  	val = intel_de_read(dev_priv, reg);
> >  	val &= ~HSW_FRAME_START_DELAY_MASK;
> > -	val |= HSW_FRAME_START_DELAY(0);
> > +	val |= HSW_FRAME_START_DELAY(dev_priv->framestart_delay);
> >  	intel_de_write(dev_priv, reg, val);
> >  }
> >  
> > @@ -8741,7 +8741,7 @@ static void i9xx_set_pipeconf(const struct intel_crtc_state *crtc_state)
> >  
> >  	pipeconf |= PIPECONF_GAMMA_MODE(crtc_state->gamma_mode);
> >  
> > -	pipeconf |= PIPECONF_FRAME_START_DELAY(0);
> > +	pipeconf |= PIPECONF_FRAME_START_DELAY(dev_priv->framestart_delay);
> >  
> >  	intel_de_write(dev_priv, PIPECONF(crtc->pipe), pipeconf);
> >  	intel_de_posting_read(dev_priv, PIPECONF(crtc->pipe));
> > @@ -9850,7 +9850,7 @@ static void ilk_set_pipeconf(const struct intel_crtc_state *crtc_state)
> >  
> >  	val |= PIPECONF_GAMMA_MODE(crtc_state->gamma_mode);
> >  
> > -	val |= PIPECONF_FRAME_START_DELAY(0);
> > +	val |= PIPECONF_FRAME_START_DELAY(dev_priv->framestart_delay);
> >  
> >  	intel_de_write(dev_priv, PIPECONF(pipe), val);
> >  	intel_de_posting_read(dev_priv, PIPECONF(pipe));
> > @@ -17153,6 +17153,8 @@ int intel_modeset_init_noirq(struct drm_i915_private *i915)
> >  	i915->flip_wq = alloc_workqueue("i915_flip", WQ_HIGHPRI |
> >  					WQ_UNBOUND, WQ_UNBOUND_MAX_ACTIVE);
> >  
> > +	i915->framestart_delay = 0; /* 0-3 */
> 
> Should we change this to default to 1 and then since its 0 based use framestart_delay - 1 everywhere?

Yeah, since the hw folks seem to like the 1-4 definition we should
probably do the same just so we're always talking the same language.

> 
> Manasi
> 
> > +
> >  	intel_mode_config_init(i915);
> >  
> >  	ret = intel_cdclk_init(i915);
> > @@ -17487,7 +17489,7 @@ static void intel_sanitize_frame_start_delay(const struct intel_crtc_state *crtc
> >  
> >  		val = intel_de_read(dev_priv, reg);
> >  		val &= ~HSW_FRAME_START_DELAY_MASK;
> > -		val |= HSW_FRAME_START_DELAY(0);
> > +		val |= HSW_FRAME_START_DELAY(dev_priv->framestart_delay);
> >  		intel_de_write(dev_priv, reg, val);
> >  	} else {
> >  		i915_reg_t reg = PIPECONF(cpu_transcoder);
> > @@ -17495,7 +17497,7 @@ static void intel_sanitize_frame_start_delay(const struct intel_crtc_state *crtc
> >  
> >  		val = intel_de_read(dev_priv, reg);
> >  		val &= ~PIPECONF_FRAME_START_DELAY_MASK;
> > -		val |= PIPECONF_FRAME_START_DELAY(0);
> > +		val |= PIPECONF_FRAME_START_DELAY(dev_priv->framestart_delay);
> >  		intel_de_write(dev_priv, reg, val);
> >  	}
> >  
> > @@ -17508,7 +17510,7 @@ static void intel_sanitize_frame_start_delay(const struct intel_crtc_state *crtc
> >  
> >  		val = intel_de_read(dev_priv, reg);
> >  		val &= ~TRANS_FRAME_START_DELAY_MASK;
> > -		val |= TRANS_FRAME_START_DELAY(0);
> > +		val |= TRANS_FRAME_START_DELAY(dev_priv->framestart_delay);
> >  		intel_de_write(dev_priv, reg, val);
> >  	} else {
> >  		enum pipe pch_transcoder = intel_crtc_pch_transcoder(crtc);
> > @@ -17517,7 +17519,7 @@ static void intel_sanitize_frame_start_delay(const struct intel_crtc_state *crtc
> >  
> >  		val = intel_de_read(dev_priv, reg);
> >  		val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;
> > -		val |= TRANS_CHICKEN2_FRAME_START_DELAY(0);
> > +		val |= TRANS_CHICKEN2_FRAME_START_DELAY(dev_priv->framestart_delay);
> >  		intel_de_write(dev_priv, reg, val);
> >  	}
> >  }
> > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> > index 15e016194685..94a27e72b0a8 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.h
> > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > @@ -1182,6 +1182,8 @@ struct drm_i915_private {
> >  		struct file *mmap_singleton;
> >  	} gem;
> >  
> > +	u8 framestart_delay;
> > +
> >  	u8 pch_ssc_use;
> >  
> >  	/* For i915gm/i945gm vblank irq workaround */
> > -- 
> > 2.19.1
> > 
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
diff mbox series

Patch

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 0189d379a55e..67a55cfa5354 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -1610,7 +1610,7 @@  static void ilk_enable_pch_transcoder(const struct intel_crtc_state *crtc_state)
 		val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
 		/* Configure frame start delay to match the CPU */
 		val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;
-		val |= TRANS_CHICKEN2_FRAME_START_DELAY(0);
+		val |= TRANS_CHICKEN2_FRAME_START_DELAY(dev_priv->framestart_delay);
 		intel_de_write(dev_priv, reg, val);
 	}
 
@@ -1621,7 +1621,7 @@  static void ilk_enable_pch_transcoder(const struct intel_crtc_state *crtc_state)
 	if (HAS_PCH_IBX(dev_priv)) {
 		/* Configure frame start delay to match the CPU */
 		val &= ~TRANS_FRAME_START_DELAY_MASK;
-		val |= TRANS_FRAME_START_DELAY(0);
+		val |= TRANS_FRAME_START_DELAY(dev_priv->framestart_delay);
 
 		/*
 		 * Make the BPC in transcoder be consistent with
@@ -1666,7 +1666,7 @@  static void lpt_enable_pch_transcoder(struct drm_i915_private *dev_priv,
 	val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
 	/* Configure frame start delay to match the CPU */
 	val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;
-	val |= TRANS_CHICKEN2_FRAME_START_DELAY(0);
+	val |= TRANS_CHICKEN2_FRAME_START_DELAY(dev_priv->framestart_delay);
 	intel_de_write(dev_priv, TRANS_CHICKEN2(PIPE_A), val);
 
 	val = TRANS_ENABLE;
@@ -6679,7 +6679,7 @@  static void hsw_set_frame_start_delay(const struct intel_crtc_state *crtc_state)
 
 	val = intel_de_read(dev_priv, reg);
 	val &= ~HSW_FRAME_START_DELAY_MASK;
-	val |= HSW_FRAME_START_DELAY(0);
+	val |= HSW_FRAME_START_DELAY(dev_priv->framestart_delay);
 	intel_de_write(dev_priv, reg, val);
 }
 
@@ -8741,7 +8741,7 @@  static void i9xx_set_pipeconf(const struct intel_crtc_state *crtc_state)
 
 	pipeconf |= PIPECONF_GAMMA_MODE(crtc_state->gamma_mode);
 
-	pipeconf |= PIPECONF_FRAME_START_DELAY(0);
+	pipeconf |= PIPECONF_FRAME_START_DELAY(dev_priv->framestart_delay);
 
 	intel_de_write(dev_priv, PIPECONF(crtc->pipe), pipeconf);
 	intel_de_posting_read(dev_priv, PIPECONF(crtc->pipe));
@@ -9850,7 +9850,7 @@  static void ilk_set_pipeconf(const struct intel_crtc_state *crtc_state)
 
 	val |= PIPECONF_GAMMA_MODE(crtc_state->gamma_mode);
 
-	val |= PIPECONF_FRAME_START_DELAY(0);
+	val |= PIPECONF_FRAME_START_DELAY(dev_priv->framestart_delay);
 
 	intel_de_write(dev_priv, PIPECONF(pipe), val);
 	intel_de_posting_read(dev_priv, PIPECONF(pipe));
@@ -17153,6 +17153,8 @@  int intel_modeset_init_noirq(struct drm_i915_private *i915)
 	i915->flip_wq = alloc_workqueue("i915_flip", WQ_HIGHPRI |
 					WQ_UNBOUND, WQ_UNBOUND_MAX_ACTIVE);
 
+	i915->framestart_delay = 0; /* 0-3 */
+
 	intel_mode_config_init(i915);
 
 	ret = intel_cdclk_init(i915);
@@ -17487,7 +17489,7 @@  static void intel_sanitize_frame_start_delay(const struct intel_crtc_state *crtc
 
 		val = intel_de_read(dev_priv, reg);
 		val &= ~HSW_FRAME_START_DELAY_MASK;
-		val |= HSW_FRAME_START_DELAY(0);
+		val |= HSW_FRAME_START_DELAY(dev_priv->framestart_delay);
 		intel_de_write(dev_priv, reg, val);
 	} else {
 		i915_reg_t reg = PIPECONF(cpu_transcoder);
@@ -17495,7 +17497,7 @@  static void intel_sanitize_frame_start_delay(const struct intel_crtc_state *crtc
 
 		val = intel_de_read(dev_priv, reg);
 		val &= ~PIPECONF_FRAME_START_DELAY_MASK;
-		val |= PIPECONF_FRAME_START_DELAY(0);
+		val |= PIPECONF_FRAME_START_DELAY(dev_priv->framestart_delay);
 		intel_de_write(dev_priv, reg, val);
 	}
 
@@ -17508,7 +17510,7 @@  static void intel_sanitize_frame_start_delay(const struct intel_crtc_state *crtc
 
 		val = intel_de_read(dev_priv, reg);
 		val &= ~TRANS_FRAME_START_DELAY_MASK;
-		val |= TRANS_FRAME_START_DELAY(0);
+		val |= TRANS_FRAME_START_DELAY(dev_priv->framestart_delay);
 		intel_de_write(dev_priv, reg, val);
 	} else {
 		enum pipe pch_transcoder = intel_crtc_pch_transcoder(crtc);
@@ -17517,7 +17519,7 @@  static void intel_sanitize_frame_start_delay(const struct intel_crtc_state *crtc
 
 		val = intel_de_read(dev_priv, reg);
 		val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;
-		val |= TRANS_CHICKEN2_FRAME_START_DELAY(0);
+		val |= TRANS_CHICKEN2_FRAME_START_DELAY(dev_priv->framestart_delay);
 		intel_de_write(dev_priv, reg, val);
 	}
 }
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 15e016194685..94a27e72b0a8 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1182,6 +1182,8 @@  struct drm_i915_private {
 		struct file *mmap_singleton;
 	} gem;
 
+	u8 framestart_delay;
+
 	u8 pch_ssc_use;
 
 	/* For i915gm/i945gm vblank irq workaround */